Hardness, Total
Hardness, Total
Page 2 of 6
Hardness_PT_ULow_CPZ_Eng_Ody.fm
5. Fill this rinsed
cylinder to the 50-mL
mark with sample from
the flask. Discard
remaining contents of the
flask.
6. Pour the contents of
the 50-mL cylinder back
into the flask.
7. Add 2.0 mL of
Chlorophosphonazo
Reagent to the sample
with the Repipet Jr.
Dispenser. Swirl to mix.
8. Pour approximately
half (25 mL) of the
sample into the
Pour-Thru Cell.
You may use a clean, dry,
plastic 25-mL graduated
cylinder to measure the
sample.
9. After the flow stops,
touch
Zero.
The display will show:
0 µg/L CaCO
3
10. Add one drop of
CDTA Reagent for Ultra
Low Range Hardness to
the remaining sample in
the flask. Swirl to mix.
Complete steps 11 and 12
within one to two
minutes.
11. Pour the remaining
sample into the
Pour-Thru Cell.
After the flow stops, touch
Read. Results will appear
in µg/L CaCO
3
.
12. Using a wash bottle,
rinse the Pour-Thru Cell
with ultra-pure water
immediately after use.
Rinse the flask with ultra-
pure water. Cap when
finished.
Zero
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